Anti-loosening self-tapping screw

Abstract

The utility model discloses an anti-loosening self-tapping screw which comprises a screw rod and a screw head, a tapping tail part is arranged at one end, far away from the screw head, of the screw rod, the tapping tail part is of a pointed cone structure, and a plurality of tapping cutting edges are arranged on the tapping tail part; a spiral self-tapping thread is wound on the circumferential surface of the screw rod, the screw rod is provided with a waste discharge main flow channel and a plurality of waste discharge sub-flow channels, a plurality of main flow inlets matched with the waste discharge sub-flow channels are formed in the side wall of the waste discharge main flow channel, and a sub-flow outlet of each waste discharge sub-flow channel is connected to the corresponding main flow inlet; the shunting outlet of each waste discharge sub-runner is communicated with the external environment, the waste discharge sub-runner is inclined from the shunting inlet to the shunting outlet and deviates from the tapping tail part, the screw head is provided with a waste discharge through hole connected with the waste discharge main runner, and the hole outlet of the waste discharge through hole is communicated with the external environment. According to the utility model, the tapping embedding effect is stable and reliable, scraps and wastes can be effectively prevented from being accumulated in the hole, the fastening effect is good, and the anti-loosening effect is good.

Description

Technical Field

[0001] The utility model relates to the field of hardware screw components, in particular to a self-tapping screw with anti-loosening function. Background Art

[0002] Self-tapping screws are widely used in various industries, especially in the fields of automobiles, motorcycles, household appliances and construction, etc., because they can cut and form threads by themselves in holes without pre-tapping, thus simplifying the installation process.

[0003] Traditional self-tapping screws are provided with a pointed structure at the tail of the screw and threads for tapping on the circumferential surface of the screw rod. Most of the waste generated during the process of drilling and tapping with this kind of self-tapping screw will remain and accumulate in the hole, which will affect the quality of the internal thread made by tapping in the hole. At the same time, it will have an adverse impact on the embedding and locking stability of the self-tapping screw. When used for a long time or under the action of external forces such as vibration and impact, there is often a risk of loosening or even falling off, affecting the safety and stability of the product. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a self-tapping screw with anti-loosening function, which can effectively discharge the waste generated by self-tapping, can effectively improve the embedding and locking stability, and has good anti-loosening performance.

[0005] A self-tapping screw with anti-loosening function according to an embodiment of the utility model includes a screw rod and a screw head. The screw head is connected to one end of the screw rod. A tapping tail is provided at the end of the screw rod far from the screw head. The tapping tail is a tapered structure that narrows away from the screw head along the extending direction of the screw rod. A plurality of tapping blades are provided on the tapping tail;

[0006] A spiral self-tapping thread is wound around the circumferential surface of the screw rod. The screw rod is provided with a main waste discharge channel and a plurality of waste discharge sub-channels. A plurality of main inlets matching with each waste discharge sub-channel are provided on the side wall of the main waste discharge channel. The diversion outlet of each waste discharge sub-channel is connected to the main inlet. The diversion outlet of each waste discharge sub-channel communicates with the external environment on the circumferential surface of the screw rod. The waste discharge sub-channel inclines away from the tapping tail from the diversion inlet to the diversion outlet. The screw head is provided with a waste discharge through hole with a hole inlet connecting to the main outlet of the main waste discharge channel. The hole outlet of the waste discharge through hole communicates with the external environment on the top surface of the screw head.

[0007] In this embodiment, the aperture of the main waste discharge channel increases along the direction from the tapping tail towards the screw head.

[0008] In this embodiment, the self-tapping thread protrudes from the circumferential surface of the screw rod, and the self-tapping thread is provided with a plurality of waste discharge notches.

[0009] In this embodiment, each tapping blade is spirally bent around the tapping tail with the extending direction of the screw rod as the axis.

[0010] In this embodiment, the surface of the tapping cutting edge is covered with a wear-resistant cutting layer.

[0011] In this embodiment, the tail of the tapping is conical, and the apex angle of the cone at the tail of the tapping is less than or equal to 45°.

[0012] In this embodiment, the screw head is a polygonal prism, and the surface of the screw head is covered with an anti-slip layer.

[0013] In this embodiment, a clamping groove is provided on one side of the screw head away from the screw rod.

[0014] The embodiment of the present utility model has at least the following beneficial effects:

[0015] Through the unique pointed conical tapping tail structure and in cooperation with the tapping cutting edge, reliable drilling processing can be achieved on the embedding target, providing a good processing foundation for the subsequent tapping action. At the end of the embedding action, the tapping cutting edge can cooperate with the tapping tail to be more tightly embedded and locked into the embedding target, forming a reliable locking force. The effect of tapping and embedding is stable and reliable, and the anti-loosening effect is good; after the tapping tail cooperates with the tapping cutting edge to drill a hole, the rotating self-tapping thread taps the hole wall and finally realizes a threaded connection. The waste generated during the drilling and tapping processes passes through the waste discharge diversion channel, the waste discharge main channel, and the waste discharge through hole in sequence and is discharged into the external environment, which can effectively avoid the accumulation of debris waste in the hole, effectively ensure the accuracy of the internal thread formed by tapping, and at the same time can significantly reduce the occurrence probability of loosening problems such as slipping teeth caused by waste accumulation. The fastening effect is good, the reliability is high, and it has a good anti-loosening effect; in addition, the waste discharge diversion channel is inclined in a direction matching the rotation and embedding direction, which can effectively improve the smoothness of the waste discharge action and the waste discharge efficiency, and further effectively ensure the stability of the embedding and fastening. Description of the Drawings

[0016] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0017] Figure 1 is a three-dimensional structural schematic diagram of the anti-loosening self-tapping screw according to the embodiment of the present utility model;

[0018] Figure 2 is a three-dimensional structural schematic diagram of the anti-loosening self-tapping screw according to the embodiment of the present utility model from another perspective;

[0019] Figure 3 is a top view structural schematic diagram of the anti-loosening self-tapping screw according to the embodiment of the present utility model;

[0020] Figure 4 is along Figure 3 the cross-sectional structural schematic diagram of A-A' in

[0021] Reference numerals:

[0022] Screw 100, self-tapping thread 110, waste discharge notch 111, waste discharge main runner 120, waste discharge sub-runner 130;

[0023] Screw head 200, waste discharge through hole 210, anti-slip layer 220, card slot 230;

[0024] Tapping tail 300, tapping cutting edge 310, wear-resistant cutting layer 311. Detailed implementation manners

[0025] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, left, right, front, back, etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0027] In the description of the present utility model, if the first and the second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence of the indicated technical features.

[0028] In the description of the present utility model, unless otherwise clearly defined, terms such as setting, installation, connection, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0029] Self-tapping screws are widely used in various industries, especially in the fields of automobiles, motorcycles, household appliances, and construction, because they can cut and form threads by themselves in holes without pre-tapping, thus simplifying the installation process. Traditional self-tapping screws are provided with a pointed structure at the tail of the screw and large-pitch threads for tapping on the circumferential surface of the screw. Most of the waste generated during the drilling and tapping process of such self-tapping screws is difficult to effectively discharge, and the waste will remain and accumulate in the hole, which will affect the quality of the internal thread obtained by tapping in the hole. At the same time, it will have an adverse impact on the embedding and locking stability of the self-tapping screw. When used for a long time or under the action of external forces such as vibration and impact, there is often a risk of loosening or even falling off, seriously affecting the safety and stability of the product.

[0030] The anti-loosening technology has always been a research hotspot in the field of fasteners. Common anti-loosening methods include lock washers, pre-coated anti-loosening glue, and special materials coated on the threads. Although these methods have improved the anti-loosening performance of the screws to a certain extent, they have deficiencies such as high cost, complex operation, and environmental sensitivity. Especially for self-tapping screws that need to be disassembled and assembled frequently or work in harsh environments, their anti-loosening performance still needs to be further improved. Therefore, it is particularly important to design a self-tapping screw that can effectively prevent loosening and smoothly discharge metal chips.

[0031] The following refers to the attached Figure 1 to the attached Figure 4 to describe the anti-loosening self-tapping screw of the embodiment of the present invention, which can effectively discharge the waste generated by self-tapping, can effectively improve the embedding and locking stability, and has good anti-loosening performance.

[0032] Referring to Figures 1 to 4 a kind of anti-loosening self-tapping screw of the embodiment of the present invention includes a screw rod 100 and a screw head 200. The screw rod 100 and the screw head 200 are an integral structure. The screw head 200 is fixedly connected to one end of the screw rod 100. An end of the screw rod 100 away from the screw head 200 is provided with a tapping tail 300. The tapping tail 300 is a tapered structure that narrows away from the screw head 200 along the extending direction of the screw rod 100. The width dimension of the bottom of the tapered structure matches and is equal to the diameter of the screw rod 100, which can effectively ensure the effect of forming an entering guide for the tapered structure. A plurality of tapping blades 310 are provided on the surface of the tapping tail 300. The tapping blades 310 are used for opening holes in the embedding target;

[0033] The screw 100 is cylindrical, and a spiral self-tapping thread 110 is wound around the circumferential surface of the screw 100. The screw 100 is provided with a waste discharge main channel 120 and a plurality of waste discharge sub-channels 130. A plurality of main inlets matching each waste discharge sub-channel 130 are provided at the side wall of the waste discharge main channel 120. The diversion outlet at one end of each waste discharge sub-channel 130 is connected to the main inlet, that is, each waste discharge sub-channel 130 is provided on one side of the waste discharge main channel 120, and the diversion outlet at one end of each waste discharge sub-channel 130 is connected to the main inlet at the side wall of the waste discharge main channel 120 to achieve the connection between the waste discharge main channel 120 and the waste discharge sub-channels 130. The diversion outlet at the other end of each waste discharge sub-channel 130 penetrates through the circumferential surface of the screw 100 and communicates with the external environment. Preferably, the diversion outlet of the waste discharge sub-channel 130 is provided between two adjacent spiral threads of the self-tapping thread 110, which can ensure the working effect of the self-tapping thread 110. The path of the waste discharge sub-channel 130 from the diversion inlet to the diversion outlet is inclined away from the tapping tail 300, that is, along the extending direction from the diversion inlet to the diversion outlet, the waste discharge sub-channel 130 is inclined in the direction gradually deviating from the tapping tail 300, so as to ensure that during the process of spiral drilling and tapping and connection, the discharge direction of the waste in the waste discharge sub-channel 130 is opposite to the direction of screw rotation for drilling and tapping, and the acting force generated by the waste embedded in the inner wall of the hole of the target on the waste is matched and almost the same as the discharge direction of the waste in the waste discharge sub-channel 130, and the waste can smoothly enter the waste discharge main channel 120 along the waste discharge sub-channel 130, with high waste discharge efficiency and good waste discharge effect. The screw head 200 is provided with a waste discharge through hole 210 whose hole inlet at one end is connected to the main outlet at the other end of the waste discharge main channel 120 to achieve the connection between the waste discharge main channel 120 and the waste discharge through hole 210. The hole outlet at the other end of the waste discharge through hole 210 penetrates through the top surface of the screw head 200 and communicates with the external environment, that is, the end of the waste discharge through hole 210 far from the waste discharge main channel 120 penetrates through the top surface of the screw head 200, so that the tapping waste can be discharged to the external environment through the waste discharge sub-channel 130, the waste discharge main channel 120 and the waste discharge through hole 210 in sequence. The central axis of the waste discharge main channel 120 is collinear with the central axis of the waste discharge through hole 210 and both are parallel to the extending direction of the screw 100.

[0034] The working process of this anti-loosening self-tapping screw is as follows: The screwdriver is clamped with the screw head 200, the tapping tail 300 is aligned with the drilling position of the embedded target, the screwdriver is rotated to drive the screw 100 to rotate through the screw head 200, the rotating tapping tail 300 cooperates with the tapping blade 310 to open a hole in the embedded target, and then the rotating self-tapping thread 110 taps the hole wall drilled by the tapping tail 300 and the tapping blade 310. The waste generated during the hole opening and tapping processes enters the waste discharge sub-channel from the diversion inlet and enters the waste main channel from the diversion outlet, and finally is discharged to the outside of the screw of the present invention from the waste discharge hole at the top of the screw head 200.

[0035] Through the unique tapered tapping tail 300 structure and in cooperation with the tapping blade 310, reliable drilling can be achieved on the embedding target, providing a good machining foundation for subsequent tapping operations. At the end of the embedding action, the tapping blade 310 can cooperate with the tapping tail 300 to be more tightly embedded and locked into the embedding target, forming a reliable locking force. The effect of tapping and embedding is stable and reliable, and the anti-loosening effect is good. After the tapping tail 300 and the tapping blade 310 drill a hole, the rotating self-tapping thread 110 taps the hole wall and finally realizes a threaded connection with the internal thread of the tapped hole. The waste generated during the drilling and tapping processes is discharged to the external environment through the waste discharge shunt channel 130, the waste discharge main channel 120, and the waste discharge through hole 210 in sequence, which can effectively prevent debris waste from accumulating in the hole, effectively ensure the accuracy of the internal thread formed by tapping, and at the same time significantly reduce the occurrence probability of problems such as thread stripping caused by waste accumulation. The fastening effect is good, the reliability is high, and it has a good anti-loosening effect. In addition, the waste discharge shunt channel 130 is inclined in a direction matching the rotation and embedding direction, which can effectively improve the smoothness of the waste discharge action, with high waste discharge efficiency and good waste discharge effect, and thus can effectively ensure the stability of the embedding and fastening.

[0036] The self-tapping screw of the present utility model can be directly installed and used in the embedding target without pre-tapping, greatly simplifying the installation process and improving work efficiency. The setting of the waste discharge system can effectively reduce the problem of installation difficulties caused by the accumulation of debris waste. The design of this self-tapping screw fully considers the usage requirements under different working conditions. By adjusting parameters such as the number and angle of the tapping blades 310 and the layout of the waste discharge channels, it can adapt to substrates of different materials and different hole diameters, and has wide applicability. While improving the anti-loosening performance and installation efficiency of the self-tapping screw of the present utility model, it also reduces the maintenance costs and potential safety hazards caused by problems such as loosening and falling off, bringing significant economic and social benefits to enterprises and users.

[0037] It can be understood that the aperture of the waste discharge main channel 120 gradually increases in the direction of the tapping tail 300 towards the screw head 200, that is, along the direction of waste advancement and discharge, the width of the waste main channel continuously increases, which can effectively improve the waste discharge efficiency, and can effectively ensure the waste discharge effect, and can effectively improve the reliability of the drilling and tapping work of the self-tapping screw. When the waste discharge main channel 120 is a circular hole channel, the diameter of the waste discharge main channel 120 increases in the direction of the tapping tail 300 towards the screw head 200.

[0038] It can be understood that the self-tapping thread 110 protrudes from the circumferential surface of the screw rod 100. The self-tapping thread 110 is provided with a number of rows of waste notches 111. By setting the waste notches 111, it is used to realize the transfer of waste between different circles of the self-tapping thread 110. Cooperating with the waste discharge shunt channel 130, the waste discharge main channel 120 and the waste discharge through hole 210, the discharge of waste can be realized from different dimensions, which can effectively improve the waste discharge effect, and further improve the reliability of the self-tapping screw embedded in the fastening structure.

[0039] It should be noted that along the direction perpendicular to the screw rod 100, the width of the self-tapping thread 110 continuously narrows to form a blade edge, which can effectively improve the tapping effect.

[0040] It can be understood that each cutting edge 310 is spirally bent around the tapping tail 300 with the extending direction of the screw rod 100 as the axis. Through the spiral bending setting of the cutting edge 310, the smoothness of the drilling action can be effectively improved, the drilling efficiency can be effectively improved, and the drilling effect can be improved.

[0041] Specifically, the distance between every two adjacent cutting edges 310 is set as the blade spacing. The blade spacing gradually decreases along the direction from the screw head 200 towards the tapping tail 300, which can make the cutting edge 310 cooperate with the tapping tail 300 to form a sharper drill bit structure and effectively improve the drilling effect.

[0042] It can be understood that the surface of the cutting edge 310 is covered with a wear-resistant cutting layer 311. The wear-resistant cutting layer 311 is used to protect the cutting edge 310 and can effectively extend the service life of the cutting edge 310. The wear-resistant cutting layer 311 can be set as a high-strength wear-resistant structural layer such as a tungsten metal layer or a tungsten alloy layer.

[0043] It can be understood that the tapping tail 300 has a pyramid-shaped structure or a cone-shaped structure, and the surfaces of these pyramid-shaped structures or cone-shaped structures can be set as irregular structures for cooperating with the cutting edge 310, which can effectively improve the cutting and drilling efficiency. The apex angle of the tapping tail 300 is less than or equal to 45°, which can effectively improve the smoothness of the drilling action, and thus can effectively improve the drilling effect. When the tapping tail 300 is a cone-shaped structure, the bottom diameter of the tapping tail 300 is the same as the diameter of the screw rod 100, and the bottom of the tapping tail 300 is connected to the screw rod 100. The apex of the tapping tail 300 is arranged away from the screw head 200, and the cone angle of the tapping tail 300 is less than or equal to 45°.

[0044] It can be understood that the screw head 200 is a flat polygonal prism, generally set as a flat hexagonal prism. The screw head 200 with this structure realizes card positioning in an outer enclosure form, which can effectively increase the contact area between the screwdriver and the screw head 200, thereby effectively improving the stress performance of the screw head 200. The surface of the screw head 200 is covered with an anti-slip layer 220. By setting the anti-slip layer 220, slippage between the screw head 200 and the anti-slip layer 220 can be effectively avoided, and the stability of the drilling and tapping operations can be effectively improved.

[0045] Specifically, the anti-slip layer 220 can be set as a polyurethane layer. Polyurethane has good wear resistance and anti-slip performance, which can effectively protect the screw head 200 and at the same time effectively improve the stability of the twisting action.

[0046] It can be understood that a card slot 230 is provided on the side of the screw head 200 away from the screw rod 100. The card slot 230 can be a flat-slot card slot 230 or a cross-slot card slot 230 for connecting with a screwdriver.

[0047] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A self-tapping screw that prevents loosening, characterized in that, It includes a screw rod (100) and a screw head (200). The screw head (200) is connected to one end of the screw rod (100). A tapping tail (300) is provided at the end of the screw rod (100) away from the screw head (200). The tapping tail (300) is a tapered structure that narrows away from the screw head (200) along the extending direction of the screw rod (100). A number of tapping blades (310) are provided on the tapping tail (300). A spiral self-tapping thread (110) is wound around the circumferential surface of the screw rod (100). The screw rod (100) is provided with a waste discharge main channel (120) and a number of waste discharge sub-channels (130). A number of main inlets matching each of the waste discharge sub-channels (130) are provided at the side wall of the waste discharge main channel (120). The diversion outlet of each waste discharge sub-channel (130) is connected to the main inlet. The diversion outlet of each waste discharge sub-channel (130) communicates with the external environment on the circumferential surface of the screw rod (100). The waste discharge sub-channel (130) inclines away from the tapping tail (300) from the diversion inlet to the diversion outlet. The screw head (200) is provided with a waste discharge through hole (210) with a hole inlet connecting to the main outlet of the waste discharge main channel (120). The hole outlet of the waste discharge through hole (210) communicates with the external environment on the top surface of the screw head (200).

2. The self-tapping screw for preventing loosening according to claim 1, characterized in that, The aperture of the waste discharge main channel (120) increases along the direction of the tapping tail (300) towards the screw head (200).

3. The self-tapping screw for preventing loosening according to claim 1, characterized in that, The self-tapping thread (110) protrudes from the circumferential surface of the screw rod (100). The self-tapping thread (110) is provided with a number of waste discharge notches (111).

4. The self-tapping screw with anti-loosening function according to claim 1, wherein Each of the tapping blades (310) is spirally bent around the tapping tail (300) with the extending direction of the screw rod (100) as the axis.

5. The self-tapping screw for preventing loosening according to claim 1, wherein, The surface of the tapping blade (310) is covered with a wear-resistant cutting layer (311).

6. The self-tapping screw for preventing loosening according to claim 1, wherein, The tapping tail (300) is conical, and the cone apex angle of the tapping tail (300) is less than or equal to 45°.

7. The self-tapping screw for preventing loosening according to claim 1, characterized in that, The screw head (200) is a polygonal prism, and the surface of the screw head (200) is covered with an anti-slip layer (220).

8. The self-tapping screw for preventing loosening according to claim 1, characterized in that, A clamping groove (230) is provided on the side of the screw head (200) away from the screw rod (100).

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